After trying another design and breaking the ‘toes’ off of a few feet previously (probably a print issue, admittedly) I decided to utilize Tterbocharged's file for the v400. Now the ball is fully supported around its circumference, and they're moved inboard to hopefully provide more support.

https://www.amazon.com/Tecnifibre-Double-Yellow-Squash-Balls/dp/B01NBLQ12U/ref=sr_1_4?dchild=1&keywords=squash+balls&qid=1626379656&sr=8-4